【作者】

任培荣; 左正兴; 冯慧华; 周海涛; 黄渭清

【单位】

北京理工大学; 中国北方发动机研究所

【摘要】

As the crack nucleation life of cast Al-Si alloy under high-cycle fatigue (HCF) condition is difficult to predict, a finite element analysis of a reference volume element containing a pore is conducted to examine the impact of pore characteristics on me-chanical response. The relationship between non-local maximum plastic shear strain amplitude (∆γ) and pore characteristics is established. The crack nucleation model is developed to predict of crack nucleation life of cylinder head. The results show a high degree of stress concentration degree at the local complex concave and convex positions. The size is main factor affecting pore harmfulness. The ∆γ increases at an accelerated rate with the increase of pore size. The crack nucleation model driven by ∆γ can be used to predict the HCF life within a ±2.5 band error. The high-stress region in the cylinder head is primarily located at the bottom plate, the inlet and exhaust walls. The combination of high stress and large pores contributes to the low HCF life of the inlet surface.

【关键词】

气缸盖;铸铝硅合金;高周疲劳;裂纹萌生

【论文集名称】

高强化材料与结构技术

【会议名称】

设计智能制造2023学术年会

【会议时间】

2023-10-20至2023-10-23

【会议地点】

湖北十堰

【下载次数】

3

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